Sharp LC-52D82U Service Manual page 51

COMPONENT: No external input video
[INPUT-1]
Is INPUT-1 selected on the input select
menu screen? Is the INPUT-SELECT for
the input signal?
YES
Select INPUT-1 on the input
select menu screen for the
right input signal.
Does the INPUT-1
C1.PLUG detection func-
tion?
Check the line between pin
(8) of input terminal (J501)
and pin (38) of IC501
(AV_SWITCH).
Is there the COMPONENT video signal
input at pins (21) (Y)/ (23) (Pb) and (25) (Pr)
of IC501 (AV_SWITCH)?
Check the line between the
input terminals of J501 and
IC501
YES
Is there the COMPONENT video signal output at pins (60) (Y) /
(59) (Pb) snd (58) (Pr) of IC501?
[COMPOSITE signal input] Is there the COMPONENT video signal output at pins (2), (4) and (6) of connector
(SC501) on the TERMINAL unit?
[S-VIDEO signal input] Is there the video signal output at pins (2)(Y) and (4)(C) of connector (SC501) on the
TERMINAL unit?
[COMPOSITE signal input] Is there the COMPONENT video signal input at pins (2), (4) and (6) of connector
(SC1101) on the main unit?
[S-VIDEO signal input] Is there the video signal input at pins (2)(Y) and (4)(C) of connector (SC1101) on the
main unit?
COMPONENT: No external input video
Is INPUT-2 selected on the input select
menu screen ? Is the INPUT-SELECT for
the input signal?
YES
NO
Is there the COMPONENT video signal
input at pins (27) (Y)/ (29) (Pb) and (31)
(Pr) of IC501 (AV_SWITCH)?
NO
YES
YES
YES
YES
No video (2)
[INPUT-2]
Is INPUT-3 selected on the input select menu
screen?
NO
Select INPUT-2 on the
input select menu screen
for the right input signal.
Does the INPUT-2
C2.PLUG detection func-
tion?
Check the line between
pin (8) of input terminal
(J502) and pin (40) of
IC501 (AV_SWITCH).
Is there the S-VIDEO signal input at pins (5)(Y)
and (7)(C) of IC501 (AV_SWITCH)?
NO
Check the line between
the input terminals of
J501 and IC501
Check IC501 and
its peripheral cir-
NO
cuits.
4 – 3
LC-46D82U/LC-52D82U
S-VIDEO: No external input video [INPUT-3]
YES
Does the INPUT-3
S3.PLUG detection function?
Check the line between pin (6) of
input terminal (J503) and pin
(42) of IC501 (AV_SWITCH).
Check the line between pins
(3)(Y)/(4)(C) of J503 and pins
(5)/(7) of IC501.
YES
Check the line
between IC501 and
SC501 (Q501 thru
NO
Q506, etc.).
Check the SC501
and SC1101 con-
NO
nectors.
NO
NO